plenty of kisses for u. >> reporter: priority using the video camera they used letters. >> i got a letter from my brother and we are happy they are ear and it gives them courage. >> reporter: they use a tube the size of a grapefruit to send food and medicine and water down the shaft to men. >> initially we thought this would take 15-20 days maximum but now we know it is a long- term project. that we have two or three months ahead. we already have one month of waiting and not very calm. >> reporter: officials say drills are ready to begin a cautious dig to where the men are trapped but could take another 2-4 months to reach them. the mineers are aware the rescue will take a long time. but they don't know exactly how long. they want them to stay mentally and physically healthy. >> there is a total change regarding the first video and the spirits are much higher. >> reporter: a group of nasa officials are recommending the miners be given extra doses of vitamin d to compensate for the lack of sunlight, an adequate exercise regimen and activities to keep them busy. in new york, peter dough(s)e